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- <h4 class="subsection">D.6.1 <code>gslevu</code> calling conventions</h4>
- <p>The input to either of these functions is a list of real numbers
- represented as explained in <a href="math.html#math">math</a>.
- <p>The result is a pair <code>(</code><var>s</var><code>,</code><var>e</var><code>)</code> holding an estimate of
- the sum, <var>s</var>, and an estimate of the error in the sum,
- <var>e</var>, each being a real number.
- <p>Both functions compute the same sum, <var>s</var>, but the <code>utrunc</code> function
- is faster and
- <a name="index-infinite-sum-725"></a>more memory efficient, using a less trustworthy method of estimating
- the error.
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